Final answer:
Ventilation should not be interrupted for more than 30 seconds to maintain healthy indoor air quality. Proper air infiltration is necessary, and homes are designed with variable air turnover times to ensure a balance between energy efficiency and health.
Step-by-step explanation:
Ventilation should not be interrupted for more than 30 seconds at any time to ensure adequate oxygen supply and to prevent the buildup of pollutants indoors. It's crucial to maintain a certain level of air infiltration in living spaces to provide fresh air. Measures like weather stripping, caulking, and better window seals can control air turnover times while ensuring there's enough fresh air for healthy living. Newly constructed homes are often designed to have an air turnover time of 2 hours or more, with extreme weather conditions leading to tighter standards. However, very long turnover times can lead to insufficient air exchange, which is not good for health.